关键词:代理签名; 椭圆曲线; 椭圆曲线离散对数问题
Improved secure proxy signature scheme based on elliptic curve
HU Lan-lana,b,c, ZHENG Kang-fenga,b,c, LI Jiana,b, HU Zheng-minga,b,c, YANG Yi-xiana,b,c
(a.Information Security Center, State Key Laboratory of Networking & Switching Technology, b.Key Laboratory of Network & Information Attack & Defence Technology of MOE, c.National Engineering Laboratory for Disaster Backup & Recovery, Beijing University of Posts & Telecommunications, Beijing 100876, China)
Abstract:To overcome the secure weakness of the existing proxy signature scheme based on elliptic curve, this paper presented an improved proxy signature scheme that could avoid forgery attack. Enhanced the security of the proxy signature scheme based on elliptic curve by improving on the generate form of the private key and the corresponding verification equation of proxy signature. The analysis showed that the new scheme resolved secure problems in the former schemes, met the six aspects of security features needed by strong proxy signature scheme, did not need the support of the secure channel, and was more efficient. The analytic results prove that the new scheme is more secure and practicable. ......